I use the galvanizing paint on my prop but for the SS rudder shoe, bottom paint.
After cleaning and sanding, the SS is coated with several coats of Interlux 2000 Epoxy. Instead of using the prime wash recommended by Interlux, I apply a thin first coat of 2000 and wire brush the SS through the epoxy. That removes metal surface contamination and the epoxy film inhibits oxygen preventing further contamination.
When the last coat of the 2000 epoxy gets tacky, the first coat of Interlux Extra bottom paint is applied.
Without the epoxy barrior coat to electrically isolate the SS from the copper in the bottom paint, the copper will get eaten up by the dissimilar metal and become ineffective in a short time.
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